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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3eed08d46177f4c1631b9b1c575d2ee992d314742d7964ff138b1c7f1b0446f6' 
  AND token = 'yThllPRo6INORYEiXDXBW8/S9aabGV0d1kNkV5Xsd1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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