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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '971993ff2171620cc083bf574801beb783c79e92cd2d3126b120a19a7a4c4e4a' 
  AND token = '4nbfyYFKGCqoXEd8H1u8dtSzJ9OO71AQ7IW+Cae7Z5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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