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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fe8fca4790d0629f92eb238f87dedf1234b3f47ddd8d4215da25e56719592d2' 
  AND token = 'lgDooTLANneHn1bhS2z0teakM5c1G5tJxN38IbMRPNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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