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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62c89c1c540bfd1c3ef94715bbed1c9b74d4afcced352c9ecc88ec5a3d611ce5' 
  AND token = 'Y+j8UA6cdMtrMjwYJuFr90UfPvD5WES0/+F1xHClB/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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