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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bafdc1f67b4c2cbb22fba7d36b0b96018797f2d762960dba8b1f1a1be4033e4e' 
  AND token = 'AwpJg0p8AEPHxrCeLZYki2x8q+yWpbtEeHf84ewwEYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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