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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd60f156c1505441e3a012f43385a05451a3f29c2c93722a8e2a65318ed65cce3' 
  AND token = '00j0xTN6atFQgEHSTZISx2dk5sS+iiPuzOc4wckimCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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