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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61c6ee8045a2b65cfb5f648a1953f173aa2e9b57858a8ce04be222cea272cd0e' 
  AND token = '43RwYSSEvEZ1hm7unNg+4lWpervFvu7G2vUCephVCP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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