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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7e28529cf630adc737bff3f3c8c702c878bd955dfac39b18102cf6ce445b553' 
  AND token = 'k0g0R4WOhvS0ddWhSAvxwLt7461bwz4HGX263ayYNfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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