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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d4dc7c83d0e2dd4d528cdfe7c956bb1ffaddead0f2d8e3143418f457e25de45' 
  AND token = 'lzweUOMDhQsbf3om4swTcf3WrA+yAYdqLU1kmomdOu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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