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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27b42beec664d38424cdbff7264ef4e44253fe78bb9c5474aaf1d8fe58883e34' 
  AND token = 'bT9+3+qX2lkS8c7PchL+TBejJUoVPc0KgmrJivTksAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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