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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd02116c571de5b83afc50c9e7b14e62bbed880fe7d546dd7c612bf9df398f8e5' 
  AND token = 's/RM8hOLuQ3FH7konPZ8TupNt9ndBOww2ylraQK11Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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