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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f15ee200028d24f802811dc249224f9784b9d2474be763e8891083c6b8928e6b' 
  AND token = 'qWvCwfC2k2VnTmo9BdHOjvQRnt4h0rODo2FCNbsJZqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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