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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee2120118ffdbd574a75284abfe7dadc2201e3ba2d46b3e0751ca4092023472c' 
  AND token = 'fA9rXF1JOb9OnFfadMTfoU5N39HIv/oEUCRevG1ij3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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