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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b03e37f57e43f9d822d1c4db6558ff66c71e9e72ccb6fc981d9885891e3c5d2' 
  AND token = 'QtAmKZAPH6vvpySdbsQ8aKeICj/nmdB8Fo/CISCbrZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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