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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2fb990ebfdbb88666edec90656f925b6e9a6277c99fd658c1f08a613264e2af' 
  AND token = '/ZJX+qNTyRXh4O+8MoAJf9YroT5Vgdb9hXfH7y4/7dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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