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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe23840a3ded4eb9590e25e197c3473520c2d27f934b8abff52631663d5f74e1' 
  AND token = 'FjhpvdgD/rK6+F1IezrTmNvREgoiz6y0oAOOBRceTlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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