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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c05c1225e5bbe4d39defa723898ea32b14a451fe11d64df901fac78d1d3cae0c' 
  AND token = 'WxDiM3AOCmIkKfA3zl5wySYVMXLdEkoHIhxnyDAwpcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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