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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '136d4d83458830ea09c58e4dd52967dea396ef3581cf89b3fcf3dfaa9196daad' 
  AND token = '/KP1oWMG9v1qa2qCJoc3C4ZWnXuN77NFtlaZAtIoki0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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