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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95cc4b098f381c1a6b381409e55d4bf7acbcfde9edb774cdcd0889e2be0686dc' 
  AND token = 'rJOQ8NJOzzswb3RZkPxS3gOF6TgvtgAHfVZS5acgvBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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