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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8d405fb501f1f544becc62891cc581bd7f5b2c988fc4df4fb5dc1722a91af51' 
  AND token = 'ALtA3eXKB99jpg9S/gDw+In+oLW8DYTqGyEQ8skD9UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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