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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb7fde0264821a637fae5d3de9ed0988df6471a2972bd26fe303ee488d35dec9' 
  AND token = 'xQik7NVZmh+d7O6dp69Kx52jEYDIpae+Mj3Y7Yz6r1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}