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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '797345c16444c1a30be3589aa5110d33b7ac5851d6ebd20f1e925ce709f26c62' 
  AND token = 'CXpvjebp2+9VA76NLv2jd4ZPFdDpiP9djla71ZeSRXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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