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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e17346c9aa39565245c5de301f8df3a154832c5f7858a94c647a7bb769aa6b9' 
  AND token = 'D8qmBndfGuNy5F88ziKdeEVvpHF7xXR1vpCqoqn6DNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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