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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e78e9d02f506869da61e7f6d2e4b09875d7bbd5cd4ca588393a6963188980d93' 
  AND token = 'uEUp1yHuENlIuiOyyGfxuFuuXGx9+kqwXRZB+VJarlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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