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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42fcdc4dd3e0008e4e0c96dcb4892e31d13d6f0b9104cae56cd0537d994589ce' 
  AND token = 'M6o0Mo1Ct+2Tz+bKtGLQPt7Dnq0ABukh0w/TTteC4dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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