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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '051694456df0d583dbeab99f40c963eb32ba61462126fffc3dcc6de520c38d5e' 
  AND token = 'txHiOGgs4zCWLkI7ejuWjt6RSPygo40OX2hUL+gXEYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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