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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88d157b9a4b31362cb5b082115519cf41a598b6dd09e02aec2aad8517b2ed13a' 
  AND token = 'kS+oBypYiDZCght37Xp+G6gceVW0wZlexB9MuxxbcTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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