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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34ece594d438154833d0b526ee8ce5fae64cc3290ff1d853cbaea0f4b22d3a63' 
  AND token = 'wS9WmyPf6mZysZw3loHVXgs467Mocd/gGz9HnuJJEMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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