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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4b68a29d50e20463352f00c380c1fd1a74d720b008e25244aa95dfecdaf5a09' 
  AND token = 'C2mFGptUbVicae9OT55RGK/H2VNK4WSzadkqbTW2SLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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