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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c87c6b37935fb1882fda3289af7cbb0b6b9263d8d48ea833c1aa331be7ae2bc6' 
  AND token = 'e3Im491FNgVMHNrS6l3EtXNFZFyVfgHTvLQ/KhJqsW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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