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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c460c7b94cab4768a53c3eb9eb76156da045a3c5fe11913cea32ea40c0d26da8' 
  AND token = 'O9/L1vDPhh+TWOdmDJ504xHReuPZ6yJyyOvSNGxzLYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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