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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3ed39db1537b5694012c902c5432922d8c40686b435738ca3a63c61374a03b6' 
  AND token = 'pMAa1U/WrcrcNUoOpMGNTs1wRBnx0Y14ujMwMTEI5J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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