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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dd21a0e36502d7d32c8061b0e596a1e59c66bc635e5cd9bd553df525b2e082b' 
  AND token = 'fySRiNqb+tw7kOOr45KbPQWgL384yfeS4ddzd7NaAEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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