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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a6850e09b58a49adf19e20725530d15c099ed8c06a0920971cc58ad3d0dfb4c' 
  AND token = 'Y/apR8yhExWhgG7x2Q/qMnTTwzrr50e+QpRrKn8pAaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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