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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b2f57640031dabc52b543f695e1d218726a8c1da9be702fda8b422ff94a1e1e' 
  AND token = '0KnDx2f+FI7dxM4YbSMyyRam4WomitELDq4wfl1qNX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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