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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38236bf6c9918c74443c095e3280c089646438bd3645f738d8ed95c2bb780b8f' 
  AND token = '3dCPyselrFmkm4X/6vsR5NvJAlMQTpGIbIbh6o7HVRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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