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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da5efbe481c3530129c81b991ad7400de383507a966930efdc3089975525d45a' 
  AND token = 'Okvy8b78daskskEZfPa5CmL87axg+Y6XorUNIqyY8yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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