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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39fbc1ec3e4d38af36bbbaecc3e980391fa1b74038e4a1ca699dc8102445bfbd' 
  AND token = 'GP+5/OibIzJhZwaXzicXU9AfcUZLcZDFEHKA0tAzOc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00196

JSON explain

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