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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e117ac6d6be0d2b11247cd8b8025b1572c2d2a3731c105b85db049a0d118c8bb' 
  AND token = '0mTR2TFIwc9sl6194lXfy0lvHSbTYbybwFEItIqS62M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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