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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8454a720e1b65fe5e6824e664ebafb7848cc40331ee1d9ee9bb9649d81ae8fd' 
  AND token = 'F2uNLVP5eX/7G4+MmMkT/84k0VXmyLBQb/HjsSFBiTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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