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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c145c1a7aaded719103a3bd473a2909e2424b0e6fb8c6688eff5a6da6f5cad94' 
  AND token = 'aJDbimajooYDAJvI9AfnHv2wSgx6iLrvyEX4sYym7Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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