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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '978309a8aeac84f05f24f45894e5566380c6088363d30b7927a6d76a9c6ae0f0' 
  AND token = '7aHJJ7SFwnxM1cKJMHFMiDC/NEhbcuo5KL5pDQi01z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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