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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f6ad4e57286750482c7657891d39a629f21c537ce93ce2a57db4dc681177078' 
  AND token = 'MqHuz30qROUrWkqQ35vYJMdrWZxxAAdBlQR7LLIdJPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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