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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4938e65a1872146895c20fc981c660bd7d1a826dfe7557e5bc0f5ef7e87038c9' 
  AND token = 'nsr2twck7KfWm10Ee0STRtR5YriQfOGNzi+MkDr/VZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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