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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f7a0f55375c7dbb46c32a4a3d757fb7ee5f207542c7d2e73e98826bcce36177' 
  AND token = '2s6EyUJh3escIFL+5bXM5fnC9KtTHCKFpvKmuPp1ohY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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