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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b17273faa1b209938bcfb6bd27371dc1b0e3083955a643e10b256023352e2d6' 
  AND token = '3gnJBq0Uq1CjlQBA9hTATkmN5/nkg9IzEr6h40zX99c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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