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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55b5dcca1d0d775d55b10ef46652c9d57612cf9270a5f2df3ee112cc322d177f' 
  AND token = 'xAeNIRtSBBoQl39nLcoOPjr6QqLvV1vL+r0nnYDLjHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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