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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cce80e19b17460f70464fd56481ccef38d1e3d92d37ef15e3bf66a3a4b0aa04' 
  AND token = 'A1MTcn++NaFfzIOPCqVPyJyjf+ZxOV902ERzvrx9zRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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